Improvement in piston-packings



l. ISLER.

Pistnn-Packings.

Patented Feb. 3.1874.

Witnesses:

the follower being removed.

UNITED STATES PATENT rTrcm.

ANDBEV J. ISLER, OF BROWNSVILLE, PENNSYLVANIA.

IMPROVEMENT IN PlSTONf-PACKINGS.

Specification forming part of Letters Patent No. 147,134, dated February 3, 1874 application Yfiled January 5, 1874.

To all whom fit may concern.

Y Be it known that I, ANDREW J. IsLER, of Brownsville, in the county of Fayette and State of Pennsylvania, have invented a new and Improved Iistpn-Packing; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming a part of this specification, in which- Figure 1 is a top view of the piston-head, Fig. 2 is a side elevation, the packing-rings being removed.

The invention relates to means whereby `wedges may be applied in a novel and useful manner to the spring packing of a piston, and to means whereby the screws that fasten the follower to the piston-head may be fastened by nuts on the outside', while the heads of the bolts are located on the inside of the pistonhead.

In the drawing, B represents the usual packing-rings, held between the head O and follower D of the piston by the bolts E. The latter are inserted, with the head next the pistonfhead, through the large opening f of the legs of the spider F, and then carried laterally into the smaller side opening fl, which is enlarged at the end next the piston-head to confine the bolt-head. A wooden or other block, G, is then inserted loosely in aperture f, so as to prevent the lateral movement of the bolt. It is thus securely held in place, while it can be readily removed. G is an inner packing-ring, held out against the packingrings B at all parts of its circumference by means of the ordinary springs H, which are usually forced against the ring G by a hammer-driven wedge, or onel operated by an adjusting-screw actuated from the outside of follower.

rIo produce a more easy and convenient mode of applying the wedge, I tongue-andgroove the wedge K, at 7.' and k', respectively, and cause it to slide between the guides h h on spring I-I, and the guides f2 fz on the inclined hub of the spider. Between the inclined guides f2 f2 I make the groove f3, which, together with wedge-groove 7c', receives the shank of bolt I, while the bolt-head passes into a recess in the spiderv next the pistonhead, and is conned in an enlarged aperture.

By turning the nut J down on the screwbolt I, the wedge is pressed with increasing force against the springs, which, in turn, expand the packing-rings.

Having thus described my inventiomwhatI claim as new, and desire to secure by Letters Patent, is

l. The combination, withheaded screw-bolts E, of the blocks Gand spider-legs, having apertures j' f1 formed therein, as and for the purpose described.

2. The combination, with headed screw-bolts I, springs II, having on back the guides hr 7l, and the hub of the spider of the piston, having the inclined guides f2 f2, of the wedge K, having tongue k, and groove le', as and for the purpose specified.

ANDBEV JACKSON ISLER.

Witnesses JOHN HERBERTsoN, I. W. PORTER. 

